Author
E. Matthias
Bio: E. Matthias is an academic researcher from Free University of Berlin. The author has contributed to research in topics: Effective nuclear charge & Hyperfine structure. The author has an hindex of 6, co-authored 7 publications receiving 100 citations.
Papers
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34 citations
01 Dec 1978
TL;DR: In this article, the 6s-7p transitions in cesium at 459.3 nm and 455.5 nm were investigated by saturation spectroscopy in vapor cells, using a laser spectrometer with 500 kHz bandwidth in the blue spectral range.
Abstract: The 6s-7p transitions in cesium at 459.3 nm (72P1/2) and 455.5 nm (72P3/2) have been investigated by saturation spectroscopy in vapor cells, using a laser spectrometer with 500 kHz bandwidth in the blue spectral range. Isotope shifts as well as hyperfine splittings were determined for the isotopes 133, 135 and 137.
26 citations
TL;DR: In this paper, the γ-ray distribution of the 11− 2 159 μs state in 115Sn was distributed by nuclear magnetic resonance yielding a magnetic moment ∣μ∣ = 1.361 ± 0.004 nm.
17 citations
TL;DR: In this article, a comprehensive description of the γ-NMR-PAD method combined with pulsed beam techniques is given, and detailed studies of the resonance behavior are performed as a function of various timing conditions, of the phase between the r.f. field and the creation time of the nuclear states, and of the amplitude of the linearly polarized r. f.f field.
Abstract: A comprehensive description is given of the γ-NMR-PAD method combined with pulsed beam techniques. Detailed studies of the resonance behaviour were performed as a function of various timing conditions, of the phase between the r.f. field and thecreation time of the nuclear states, and of the amplitude of the linearly polarized r.f. field. The following features were realized by experiments on the 20 ms state in71Ge and on the 119 μs state in78 Br, excited and oriented by nuclear reactions in liquid metallic targets: (i) The resonance behaviour was observed time-differentially, yielding accurate values of the r.f. amplitude acting at the nuclear site, and of the relaxation time. (ii) The observation of the perturbed γ-ray distribution in time windows can yield strongly structured resonances with considerably larger effects compared to time-integral resonances. The time window technique is well suited to determine the resonance point precisely, and further — in case of saturation — the relaxation time can be extracted. (iii) Absorptionand dispersion-like resonance structures were observed with fixed r.f. phases for selected time windows and phase positions, yielding the sign of the magnetic interaction and the sign of the γ-ray anisotropy. (iv) At r.f. amplitudes comparable to the static magnetic fields resonance shifts and multiple quantum effects caused by the “nonresonant” component of the r.f field were studied in γ-NMR-PAD. A comparison is given with the stroboscopic method, and some possible applications of the technique developed are discussed to observe hyperfine interactions of muons in non-metals.
11 citations
01 Jun 1981
TL;DR: In this article, Doppler-free saturation spectroscopy for the even Cd isotopes 106 through 116 was used to measure the 467.8 nm line and the average charge radii determined from their data and the rms radius of 114Cd measured with muonic X-rays verify the general trend predicted by the droplet model but are off by about 35 mfm on an absolute scale.
Abstract: Isotope shifts of the 467.8 nm line have been measured by Doppler-free saturation spectroscopy for the even Cd isotopes 106 through 116. The differential changes in mean square charge radii derived from the field shifts show a pronounced break in their trend atN=64, giving evidence for the closure of theg
7/2 neutron subshell. The average charge radii determined from our data and the rms radius of114Cd measured with muonic X-rays verify the general trend predicted by the droplet model but are off by about 35 mfm on an absolute scale. A consistent interpretation of δ〈r
2〉 further supports the necessity for considering changes in the skin thickness of the nuclear charge distribution.
8 citations
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TL;DR: In this paper, the moments of the nuclear charge distribution were derived from the size and shape of the system, from the internal redistribution induced by the Coulomb repulsion, and from the diffuseness of the surface.
197 citations
TL;DR: In this article, the decay of 132La to 132Ba has been studied in several works, including some recent papers, but in the opinion of the evaluators, this decay scheme still suffers from incompleteness, especially from the point of view of separate level schemes from the ground state and the isomeric activities.
176 citations
01 Jan 1989
TL;DR: The development of on-line mass separators, which provide long chains of isotopes extending far off stability, immediately raised the question of how to gain access to the basic nuclear ground-state properties of these exotic nuclei as mentioned in this paper.
Abstract: The development of on-line mass separators, which provide long chains of isotopes extending far off stability, immediately raised the question of how to gain access to the basic nuclear ground-state properties of these exotic nuclei—their spins, moments, radii, and masses. In general, the amount of radioactive material produced at these facilities is too small to form beams or targets for any kind of scattering or nuclear-reaction experiment. On the other hand, the traditional spectroscopic methods, namely, atomic, nuclear, and mass spectroscopy, have turned out to be very suitable for this application since they are easily adapted to the special on-line conditions.
164 citations
TL;DR: In this article, the interdisciplinary theoretical and practical problems involved in the development of devices analogous to lasers for generation of coherent radiation in the 6- to 120-keV photon energy range by stimulated emission of recoilless radiation from nuclear isomers are discussed in depth with a comprehensive bibliography.
Abstract: The interdisciplinary theoretical and practical problems involved in the development of devices analogous to lasers for generation of coherent radiation in the 6- to 120-keV photon energy range by stimulated emission of recoilless radiation from nuclear isomers are discussed in depth with a comprehensive bibliography.
116 citations
TL;DR: In this article, the energy levels and observed spectral lines of the krypton atom, in all stages of ionization for which experimental data are available, have been compiled, and sufficient data were found to generate level and line tables for Kr I-Kr X and Kr�XVIII−Kr�XXXVI.
Abstract: The energy levels and observed spectral lines of the krypton atom, in all stages of ionization for which experimental data are available, have been compiled. Sufficient data were found to generate level and line tables for Kr I–Kr X and Kr XVIII–Kr XXXVI. For Kr XXXV and Kr XXXVI and most of Kr XXXIV theoretical values are compiled for the energy levels. In all of the other stages a few lines, some of which may be only tentative classifications, are reported. In addition for Kr I, separate tables of energy levels are tabulated for the isotopes 86Kr and 84Kr. Experimental g factors are included for Kr I and Kr II. A value, either experimental, semiempirical, or theoretical, is included for the ionization energy of each ion.
104 citations